SpecDefinition referenceView source

Language Tag

A BCP-47 language tag ('en-US', 'ja', 'zh-Hans', 'sr-Latn-ME'), an engine vocabulary. Use 'en-GB' for UK English; 'en-UK' is not a valid region.

Metadata

Definition: #/$defs/LanguageTag
Form: string
Source: spec/schemas/opf.schema.json

Field index

This definition uses the forms or value constraints below.

Complete definition constraints

Exact schema constraints

{
  "type": "string",
  "pattern": "^(?:[A-Za-z]{2,3}|[iIxX])(?:-[A-Za-z0-9]{1,8})*$",
  "description": "A BCP-47 language tag ('en-US', 'ja', 'zh-Hans', 'sr-Latn-ME'), an engine vocabulary. Use 'en-GB' for UK English; 'en-UK' is not a valid region.",
  "examples": [
    "en-US",
    "en-GB",
    "ja",
    "zh-Hans",
    "ar-SA"
  ]
}